I heard a crying child, but couldn't see it anywhere
This dream could indicate that you are feeling a sense of helplessness or frustration in a situation where you are unable to offer assistance or solve a problem. The crying child could represent a part of yourself or a situation that you are trying to cope with but are finding it difficult to do so. It may be a sign that you need to examine the feelings and issues that are causing you distress and try to find an appropriate way to address them. Alternatively, it may represent a feeling of loss or sadness that you are experiencing in your waking life.